2555865 has 48 divisors (see below), whose sum is σ = 5071248. Its totient is φ = 1179648.

The previous prime is 2555863. The next prime is 2555867. The reversal of 2555865 is 5685552.

2555865 is nontrivially palindromic in base 2.

It is an interprime number because it is at equal distance from previous prime (2555863) and next prime (2555867).

It can be written as a sum of positive squares in 8 ways, for example, as 112896 + 2442969 = 336^2 + 1563^2 .

It is not a de Polignac number, because 2555865 - 2¹ = 2555863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9817 + ... + 10073.

It is an arithmetic number, because the mean of its divisors is an integer number (105651).

2^2555865 is an apocalyptic number.

It is an amenable number.

2555865 is a deficient number, since it is larger than the sum of its proper divisors (2515383).

2555865 is a wasteful number, since it uses less digits than its factorization.

2555865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 295 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The square root of 2555865 is about 1598.7072902817. The cubic root of 2555865 is about 136.7243823911.

The spelling of 2555865 in words is "two million, five hundred fifty-five thousand, eight hundred sixty-five".